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Hi John,
No, WAL consists from several constant sized, append only files (segments).
Segments are rotated and deleted after (WAL_History_size) checkpoints.
WAL is common for all caches.
If you are interested in low-level details of implementation, you can see
it here in draft wiki page for Ignite developers
https://cwiki.apache.org/confluence/display/IGNITE/Ignite+Persistent+Store+-+under+the+hood#IgnitePersistentStore-underthehood-WALstructure
Sincerely,
Dmitriy Pavlov
ср, 1 нояб. 2017 г. в 20:36, John Wilson <sami.hailu.15@gmail.com>:
> Hi,
>
> Is the WAL a memory mapped file? Is it defined per cache?
>
> Thanks.
>